Incineration has been used to dispose municipal solid waste(MSW) in the world.Attention is paid to the secondary pollution from municipal solid waste incineration(MSWI).Especially the safe and effective disposal of MSWI fly ash becomes an environmental and social problem which should be urgently resolved.The paper focuseds on the properties of MSW fly ash.The different kinds of technology of MSW fly ash are analysed in details.The main disposals of MSWI fly ash are filling,solidification and stabilization,and distilling heavy metals.The innocuous disposal of MSW fly ash which is compatible in China is impoldering advanced incinerator controlling the MSW and research effective and inexpensive stabilization chemicals and effective technique of distilling heavy metals to reduce the secondary pollution caused by the heavy metal of MSWI fly ash.